Abstract: During the service of an aero-engine plunger pump, some slippers were found to have abnormal wear. Through macro and micro observation, energy spectrum analysis, Brinell hardness testing, and frictional wear test, a systematic comparative study was conducted on the difference in frictional wear behaviors between normal and abnormal slipper materials after long-term service, and the frictional wear properties of different new copper alloys were compared and analyzed. The results show that under dry friction conditions, the normal slippers are primarily characterized by slight adhesive wear, while the abnormal ones exhibit both adhesive wear and abrasive wear, with a specific wear rate nearly twice that of the normal slippers. ZCuPb10Sn10, ZCuSb5P, ZCuSb3Ni3Zn3Pb20P, ZCuPb20Sn5, and ZCuSn10Pb2Ni3 copper alloys mainly exhibit abrasive wear during dry friction, accompanied by light or heavy adhesive wear, and the worn surface has deep furrows and abrasive debris and pits with different sizes. The friction coefficient of ZCuPb10Sn10 copper alloy is relatively stable, and its overall wear rate is low, only 3.444×10⁻⁵ mm³·N⁻¹·m⁻¹. Compared with other copper alloys, it exhibits better wear resistance, suitable for plunger pump slippers.